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Mechanisms of Andreev reflection in quantum Hall graphene

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arxiv 2103.06722 v4 pith:2IHJYEZT submitted 2021-03-11 cond-mat.mes-hall

Antonio L. R. Manesco , Ian Matthias Flór , Chun-Xiao Liu , Anton R. Akhmerov This is my paper · ORCID
classification cond-mat.mes-hall
keywords experimenthalloscillationspreviouslyquantumstatesadditionalternative
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We simulate a hybrid superconductor-graphene device in the quantum Hall regime to identify the origin of downstream resistance oscillations in a recent experiment [Zhao et. al. Nature Physics 16, (2020)]. In addition to the previously studied Mach-Zehnder interference between the valley-polarized edge states, we consider disorder-induced scattering, and the previously overlooked appearance of the counter-propagating states generated by the interface density mismatch. Comparing our results with the experiment, we conclude that the observed oscillations are induced by the interfacial disorder, and that lattice-matched superconductors are necessary to observe the alternative ballistic effects.

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  1. Quantum Hall Andreev Conversion in Graphene Nanostructures

    cond-mat.mes-hall 2025-07 conditional novelty 6.0 of 10

    Chiral Andreev conversion at partially transparent graphene-superconductor interfaces is robust, not valley-degenerate, and can show interference oscillations from intervalley scattering at corners.

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